#define _CRT_SECURE_NO_WARNINGS 1

#include <stdio.h>

int main()
{
	int i = 0;
	int a = 0;
	int b = 0;
	int count = 0;
	scanf("%d %d", &a, &b);
	for (i = 0; i < 32; i++)
	{
		if ((1 & (a >> i)) != (1 & (b >> i)))
		{
			count++;
		}
	}
	printf("%d", count);
	return 0;
}
//00000000000000000000000000010110
//00000000000000000000000000100001
//00000000000000000000000000000001